﻿// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

using System.Drawing;

namespace System.Windows.Forms.Tests.Text;

public class FontMetrics
{
    [Theory]
    [InlineData("Arial", 9.0f, 15)]
    [InlineData("Arial", 12.0f, 18)]
    [InlineData("Microsoft Sans Serif", 16.0f, 26)]
    [InlineData("Times New Roman", 11.0f, 17)]
    [InlineData("MS Gothic", 10.0f, 14)]
    public void Font_GetHeight(string family, float size, int height)
    {
        using Font font = new(family, size);
        if (font.Name != family)
        {
            // Not installed on this machine
            return;
        }

        using var hfont = GdiCache.GetHFONT(font, FONT_QUALITY.CLEARTYPE_QUALITY);
        Assert.Equal(height, hfont.Data.Height);
    }

    [Theory]
    [InlineData("Arial", 9.0f, 3, 4)]
    [InlineData("Arial", 12.0f, 3, 5)]
    [InlineData("Microsoft Sans Serif", 16.0f, 5, 7)]
    [InlineData("Times New Roman", 11.0f, 3, 5)]
    [InlineData("MS Gothic", 10.0f, 3, 4)]
    public void Font_GetTextMargins(string family, float size, int left, int right)
    {
        using Font font = new(family, size);
        if (font.Name != family)
        {
            // Not installed on this machine
            return;
        }

        using var hfont = GdiCache.GetHFONT(font, FONT_QUALITY.CLEARTYPE_QUALITY);
        DRAWTEXTPARAMS margins = hfont.GetTextMargins();
        Assert.Equal(left, margins.iLeftMargin);
        Assert.Equal(right, margins.iRightMargin);
    }

    [Theory]
    [InlineData("Arial", 9.0f, 73, 15)]
    [InlineData("Arial", 12.0f, 95, 18)]
    [InlineData("Microsoft Sans Serif", 16.0f, 136, 26)]
    [InlineData("Times New Roman", 11.0f, 84, 17)]
    [InlineData("MS Gothic", 10.0f, 91, 14)]
    public void Font_GetTextExtent(string family, float size, int width, int height)
    {
        using Font font = new(family, size);
        if (font.Name != family)
        {
            // Not installed on this machine
            return;
        }

        using var hfont = GdiCache.GetHFONT(font, FONT_QUALITY.CLEARTYPE_QUALITY);
        using var screen = GdiCache.GetScreenHdc();
        Size extent = screen.HDC.GetTextExtent("Whizzo Butter", hfont);
        Assert.Equal(width, extent.Width);
        Assert.Equal(height, extent.Height);
    }

    [Theory(Skip = "Flaky in debug builds. See: https://github.com/dotnet/winforms/issues/8612")]
    [MemberData(nameof(MeasureTextData))]
    public void Font_MeasureText(string family, float size, Size proposedSize, uint dt, Size expected)
    {
        using Font font = new(family, size);
        if (font.Name != family)
        {
            // Not installed on this machine
            return;
        }

        using var hfont = GdiCache.GetHFONT(font, FONT_QUALITY.CLEARTYPE_QUALITY);
        using var screen = GdiCache.GetScreenHdc();
        Size measure = screen.HDC.MeasureText("Windows Foundation Classes", hfont, proposedSize, (TextFormatFlags)dt);
        Assert.Equal(expected, measure);
    }

    public static TheoryData<string, float, Size, uint, Size> MeasureTextData =>
        new()
        {
            { "Arial", 9.0f, new Size(-1, -1), (uint)DRAW_TEXT_FORMAT.DT_BOTTOM, new Size(173, 15) },
            { "Arial", 12.0f, new Size(-1, -1), (uint)DRAW_TEXT_FORMAT.DT_BOTTOM, new Size(215, 18) },
            { "Microsoft Sans Serif", 16.0f, new Size(-1, -1), (uint)DRAW_TEXT_FORMAT.DT_BOTTOM, new Size(299, 26) },
            { "Times New Roman", 11.0f, new Size(-1, -1), (uint)DRAW_TEXT_FORMAT.DT_BOTTOM, new Size(179, 17) },
            { "MS Gothic", 10.0f, new Size(-1, -1), (uint)DRAW_TEXT_FORMAT.DT_BOTTOM, new Size(189, 14) },
            { "Arial", 9.0f, new Size(0, 0), (uint)DRAW_TEXT_FORMAT.DT_BOTTOM, new Size(173, 15) },
            { "Arial", 12.0f, new Size(0, 0), (uint)DRAW_TEXT_FORMAT.DT_BOTTOM, new Size(215, 18) },
            { "Microsoft Sans Serif", 16.0f, new Size(0, 0), (uint)DRAW_TEXT_FORMAT.DT_BOTTOM, new Size(299, 26) },
            { "Times New Roman", 11.0f, new Size(0, 0), (uint)DRAW_TEXT_FORMAT.DT_BOTTOM, new Size(179, 17) },
            { "MS Gothic", 10.0f, new Size(0, 0), (uint)DRAW_TEXT_FORMAT.DT_BOTTOM, new Size(189, 14) },
            { "Arial", 9.0f, new Size(1, 1), (uint)DRAW_TEXT_FORMAT.DT_BOTTOM, new Size(173, 15) },
            { "Arial", 12.0f, new Size(1, 1), (uint)DRAW_TEXT_FORMAT.DT_BOTTOM, new Size(215, 18) },
            { "Microsoft Sans Serif", 16.0f, new Size(1, 1), (uint)DRAW_TEXT_FORMAT.DT_BOTTOM, new Size(299, 26) },
            { "Times New Roman", 11.0f, new Size(1, 1), (uint)DRAW_TEXT_FORMAT.DT_BOTTOM, new Size(179, 17) },
            { "MS Gothic", 10.0f, new Size(1, 1), (uint)DRAW_TEXT_FORMAT.DT_BOTTOM, new Size(189, 14) },
            { "Arial", 9.0f, new Size(300, 300), (uint)DRAW_TEXT_FORMAT.DT_BOTTOM, new Size(173, 15) },
            { "Arial", 12.0f, new Size(300, 300), (uint)DRAW_TEXT_FORMAT.DT_BOTTOM, new Size(215, 18) },
            { "Microsoft Sans Serif", 16.0f, new Size(300, 300), (uint)DRAW_TEXT_FORMAT.DT_BOTTOM, new Size(299, 26) },
            { "Times New Roman", 11.0f, new Size(300, 300), (uint)DRAW_TEXT_FORMAT.DT_BOTTOM, new Size(179, 17) },
            { "MS Gothic", 10.0f, new Size(300, 300), (uint)DRAW_TEXT_FORMAT.DT_BOTTOM, new Size(189, 14) },
            { "Arial", 9.0f, new Size(int.MaxValue, int.MaxValue), (uint)DRAW_TEXT_FORMAT.DT_BOTTOM, new Size(173, 15) },
            { "Arial", 12.0f, new Size(int.MaxValue, int.MaxValue), (uint)DRAW_TEXT_FORMAT.DT_BOTTOM, new Size(215, 18) },
            { "Microsoft Sans Serif", 16.0f, new Size(int.MaxValue, int.MaxValue), (uint)DRAW_TEXT_FORMAT.DT_BOTTOM, new Size(299, 26) },
            { "Times New Roman", 11.0f, new Size(int.MaxValue, int.MaxValue), (uint)DRAW_TEXT_FORMAT.DT_BOTTOM, new Size(179, 17) },
            { "MS Gothic", 10.0f, new Size(int.MaxValue, int.MaxValue), (uint)DRAW_TEXT_FORMAT.DT_BOTTOM, new Size(189, 14) },
            { "Arial", 9.0f, new Size(1, 1), (uint)DRAW_TEXT_FORMAT.DT_SINGLELINE, new Size(173, 15) },
            { "Arial", 12.0f, new Size(1, 1), (uint)DRAW_TEXT_FORMAT.DT_SINGLELINE, new Size(215, 18) },
            { "Microsoft Sans Serif", 16.0f, new Size(1, 1), (uint)DRAW_TEXT_FORMAT.DT_SINGLELINE, new Size(299, 26) },
            { "Times New Roman", 11.0f, new Size(1, 1), (uint)DRAW_TEXT_FORMAT.DT_SINGLELINE, new Size(179, 17) },
            { "MS Gothic", 10.0f, new Size(1, 1), (uint)DRAW_TEXT_FORMAT.DT_SINGLELINE, new Size(189, 14) },
            { "Arial", 9.0f, new Size(int.MaxValue, int.MaxValue), (uint)DRAW_TEXT_FORMAT.DT_SINGLELINE, new Size(173, 15) },
            { "Arial", 12.0f, new Size(int.MaxValue, int.MaxValue), (uint)DRAW_TEXT_FORMAT.DT_SINGLELINE, new Size(215, 18) },
            { "Microsoft Sans Serif", 16.0f, new Size(int.MaxValue, int.MaxValue), (uint)DRAW_TEXT_FORMAT.DT_SINGLELINE, new Size(299, 26) },
            { "Times New Roman", 11.0f, new Size(int.MaxValue, int.MaxValue), (uint)DRAW_TEXT_FORMAT.DT_SINGLELINE, new Size(179, 17) },
            { "MS Gothic", 10.0f, new Size(int.MaxValue, int.MaxValue), (uint)DRAW_TEXT_FORMAT.DT_SINGLELINE, new Size(189, 14) },
        };

    [Theory]
    [MemberData(nameof(AdjustData))]
    public unsafe void Font_AdjustForVerticalAlignment(string family, float size, Rectangle bounds, uint dt, Rectangle expected)
    {
        using Font font = new(family, size);
        if (font.Name != family)
        {
            // Not installed on this machine
            return;
        }

        using var hfont = GdiCache.GetHFONT(font, FONT_QUALITY.CLEARTYPE_QUALITY);
        using var screen = GdiCache.GetScreenHdc();
        using SelectObjectScope fontSelection = new(screen, hfont.Object);

        DRAWTEXTPARAMS param = default;
        Rectangle result = screen.HDC.AdjustForVerticalAlignment(
            "Windows Foundation Classes",
            bounds,
            (DRAW_TEXT_FORMAT)dt,
            &param);
        Assert.Equal(expected, result);
    }

    public static TheoryData<string, float, Rectangle, uint, Rectangle> AdjustData =>
        new()
        {
            { "Arial", 9.0f, new Rectangle(1, 1, 1, 1), (uint)DRAW_TEXT_FORMAT.DT_BOTTOM, new Rectangle(1, 1, 1, 1) },
            { "Arial", 12.0f, new Rectangle(1, 1, 1, 1), (uint)DRAW_TEXT_FORMAT.DT_BOTTOM, new Rectangle(1, 1, 1, 1) },
            { "Microsoft Sans Serif", 16.0f, new Rectangle(1, 1, 1, 1), (uint)DRAW_TEXT_FORMAT.DT_BOTTOM, new Rectangle(1, 1, 1, 1) },
            { "Times New Roman", 11.0f, new Rectangle(1, 1, 1, 1), (uint)DRAW_TEXT_FORMAT.DT_BOTTOM, new Rectangle(1, 1, 1, 1) },
            { "MS Gothic", 10.0f, new Rectangle(1, 1, 1, 1), (uint)DRAW_TEXT_FORMAT.DT_BOTTOM, new Rectangle(1, 1, 1, 1) },
            { "Arial", 9.0f, new Rectangle(1, 1, 100, 100), (uint)DRAW_TEXT_FORMAT.DT_BOTTOM, new Rectangle(1, 86, 100, 100) },
            { "Arial", 12.0f, new Rectangle(1, 1, 100, 100), (uint)DRAW_TEXT_FORMAT.DT_BOTTOM, new Rectangle(1, 83, 100, 100) },
            { "Microsoft Sans Serif", 16.0f, new Rectangle(1, 1, 100, 100), (uint)DRAW_TEXT_FORMAT.DT_BOTTOM, new Rectangle(1, 75, 100, 100) },
            { "Times New Roman", 11.0f, new Rectangle(1, 1, 100, 100), (uint)DRAW_TEXT_FORMAT.DT_BOTTOM, new Rectangle(1, 84, 100, 100) },
            { "MS Gothic", 10.0f, new Rectangle(1, 1, 100, 100), (uint)DRAW_TEXT_FORMAT.DT_BOTTOM, new Rectangle(1, 87, 100, 100) },
        };
}
